Tad Tucker's life has taken a downward spiral. His grades are suffering, kids at school are teasing and tormenting him, his best friend is not speaking, his crush thinks he is weird, his parents are fighting; essentially nothing has gone right for the 10-year-old boy ever since he saw that "Elf". No one will believe him, and he has to find a way to prove his story is true. Meanwhile, that "Elf", Pedwyn Dale, who accidentally allowed himself to be seen by a human child, must journey back to the World and make amends. Faced with banishment from his Faery home in Hollow Hill, Pedwyn Dale and a troop of his Fae friends venture to the home of the Tucker in order to try and make him forget…everything.

What happens when two magical worlds collide, and a human child sees a creature of Faerie? Well, for both Tad Tucker, the boy who saw him, and for Pedwyn Dale, the solitary Faery who accidentally slipped through a Mist-Hole to the World, it brings nothing but trouble. Tad cannot convince anyone he really saw something. Pedwyn cannot convince the powers in Faerie that he was not seen. So, something has to be done to fix the situation. Tasked with solving this problem by the Shee-Queen, Pedwyn and his friends, the Pixie medium BeBoo Pevin, the brooding Spriggan, Wippa, Fee the Dink, and Hetchy the Bogie, must travel through the Mists to the World and get the human child to eat a slice of Mooncheese, which causes one to forget things they no longer need to know, like seeing Pedwyn Dale. While Tad Tucker frustratingly tries to get people to believe him, Pedywn and his companion troop journey across an extremely unfamiliar landscape to find the House of the Tucker, fix Pedwyn's mistake, and get back home.